Hi Victor / Patricio,
I have been using Hector library's TimeUUIDUtils. I also just looked at
TimeUUIDUtilsTest also but didn't find anything similar being tested there.
Here is what I am trying and it's not working - I am creating a Time UUID,
extracting its timestamp value and with that I create another Time UUID and
I am expecting both time UUIDs to have the same timestamp() value - am I
doing / expecting something wrong here?:
=======================================================
import java.util.UUID;
import me.prettyprint.cassandra.utils.TimeUUIDUtils;
public class TryHector {
public static void main(String[] args) throws Exception {
UUID someUUID = TimeUUIDUtils.getUniqueTimeUUIDinMillis();
long timestamp1 = someUUID.timestamp();
UUID otherUUID = TimeUUIDUtils.getTimeUUID(timestamp1);
long timestamp2 = otherUUID.timestamp();
System.out.println(timestamp1);
System.out.println(timestamp2);
}
}
=======================================================
I have to create the timestamp() equivalent of my time UUIDs so I can send
it to my UI client, for which it will be simpler to compare "long" timestamp
than comparing UUIDs. Then for the "long" timestamp chosen by the client, I
need to re-create the equivalent time UUID and go and filter the data from
Cassandra database.
--
Roshan
Blog: http://roshandawrani.wordpress.com/
Twitter: @roshandawrani <http://twitter.com/roshandawrani>
Skype: roshandawrani
On Wed, Jan 5, 2011 at 1:32 AM, Victor Kabdebon
<victor.kabde...@gmail.com>wrote:
> Hi Roshan,
>
> Sorry I misunderstood your problem.It is weird that it doesn't work, it
> works for me...
> As Patricio pointed out use hector "standard" way of creating TimeUUID and
> tell us if it still doesn't work.
> Maybe you can paste here some of the code you use to query your columns
> too.
>
> Victor K.
> http://www.voxnucleus.fr
>
> 2011/1/4 Patricio Echagüe <patric...@gmail.com>
>
> In Hector framework, take a look at TimeUUIDUtils.java
>>
>> You can create a UUID using TimeUUIDUtils.getTimeUUID(long time); or
>> TimeUUIDUtils.getTimeUUID(ClockResolution clock)
>>
>> and later on, TimeUUIDUtils.getTimeFromUUID(..) or just UUID.timestamp();
>>
>> There are some example in TimeUUIDUtilsTest.java
>>
>> Let me know if it helps.
>>
>>
>>
>>
>> On Tue, Jan 4, 2011 at 10:27 AM, Roshan Dawrani
>> <roshandawr...@gmail.com>wrote:
>>
>>> Hello Victor,
>>>
>>> It is actually not that I need the 2 UUIDs to be exactly same - they need
>>> to be same timestamp wise.
>>>
>>> So, what I need is to extract the timestamp portion from a time UUID
>>> (say, U1) and then later in the cycle, use the same long timestamp value to
>>> re-create a UUID (say, U2) that is equivalent of the previous one in terms
>>> of its timestamp portion - i.e., I should be able to give this U2 and filter
>>> the data from a column family - and it should be same as if I had used the
>>> original UUID U1.
>>>
>>> Does it make any more sense than before? Any way I can do that?
>>>
>>> rgds,
>>> Roshan
>>>
>>>
>>> On Tue, Jan 4, 2011 at 11:46 PM, Victor Kabdebon <
>>> victor.kabde...@gmail.com> wrote:
>>>
>>>> Hello Roshan,
>>>>
>>>> Well it is normal to do not be able to get the exact same UUID from a
>>>> timestamp, it is its purpose.
>>>> When you create an UUID you have in fact two information : random 64
>>>> bits number - 64 bits timestamp. You put that together and you have your
>>>> uuid.
>>>> .
>>>> So unless you save your random number two UUID for the same milli( or
>>>> micro) second are different.
>>>>
>>>> Best regards,
>>>> Victor K.
>>>> http://www.voxnucleus.fr
>>>>
>>>> 2011/1/4 Roshan Dawrani <roshandawr...@gmail.com>
>>>>
>>>> Hi,
>>>>> I am having a little difficulty converting a time UUID to its timestamp
>>>>> equivalent and back. Can someone please help?
>>>>>
>>>>> Here is what I am trying. Is it not the right way to do it?
>>>>>
>>>>> ===========================================================
>>>>> UUID someUUID = TimeUUIDUtils.getUniqueTimeUUIDinMillis();
>>>>>
>>>>> long time = someUUID.timestamp(); /* convery from UUID to a
>>>>> long timestamp */
>>>>> UUID otherUUID = TimeUUIDUtils.getTimeUUID(time); /* do the
>>>>> reverse and get back the UUID from timestamp */
>>>>>
>>>>> System.out.println(someUUID); /* someUUID and otherUUID should
>>>>> be same, but are different */
>>>>> System.out.println(otherUUID);
>>>>> ===========================================================
>>>>>
>>>>> --
>>>>> Roshan
>>>>> Blog: http://roshandawrani.wordpress.com/
>>>>> Twitter: @roshandawrani <http://twitter.com/roshandawrani>
>>>>> Skype: roshandawrani
>>>>>
>>>>>
>>>>
>>>
>>>
>>> --
>>> Roshan
>>> Blog: http://roshandawrani.wordpress.com/
>>> Twitter: @roshandawrani <http://twitter.com/roshandawrani>
>>> Skype: roshandawrani
>>>
>>>
>>
>>
>> --
>> Patricio.-
>>
>
>
